Screw-lock.



Patented Jan. 7, 1913.

FIG 5 12 H FIG.6

INVENTOR John Thom I ATTORNEYS J. THOMAS. SCREW LOGK.

. APPLICATION FILED AUG. 23, 1912.

FIG. 3

UNITED STATES PATENT QFFICE.

JOHN THOMAS, 0F VTINNIPEG, MANITOBA, CANADA, ASSIGNOR OF ONE-HALF T0ANNA PANCZUK, OF WINNIPEG, CANADA.

SCREW-LOCK.

To all wlzomit may concern Be it known that I, JOHN THOMAS, a subject ofthe Emperor of Austria-Hungary, residing at lVinnipeg, Manitoba, Canada,have invented certain new and useful Improvements in Screw-Locks, ofwhich the following is a specification, reference being had therein tothe accompanying drawing.

This invention relates to a screw lock, and the primary object of myinvention is to provide novel means, as hereinafter set forth, forlocking a screw whereby the same cannot become loose or accidentallydisplaced.

A further object of this invention is to provide a simple andinexpensive screw locking device that is strong and durable and highlyeflicient for the purposes for which it is intended.

I attain the above objects by a mechanical construction that will behereinafter specifically described and then claimed, and reference willnow be had to the drawing, wherein there are illustrated the preferredembodiments of my invention, but it is to be understood that thestructural elements are susceptible to such changes as fall within thescope of the appended claim.

In the drawing :Figure 1 is a front elevation of a piece of materialprovided with a screw lock. Fig. 2 is a cross sectional view of thesame. Fig. 3 illustrates detailed views of the preferred form of washerforming part of the lock. Fig. 4 illustrates details of a modified formof washer. Fig. 5 is a perspective view of the detached locking staple,and Fig. 6 is a front elevation of a further modified form of washer.

The reference numeral 1 denotes, by the way of an example, pieces ofmaterial connected by a screw 2 having a shank 3 and a slotted head 4:.The piece of material that receives the shank 3 is provided with anannular recess or socket 5 for a washer 6 that is of a diameter slightlygreater than the recess 5, whereby it will be necessary to drive orforce a washer into the recess in order that said washer will bepermanently held therein against rotation as the screw 2 is screwed intothe material. The washer 6 is Specification of Letters Patent.

Application filed August 23, 1912.

Patented Jan. '7, 1913.

Serial No. 716,780.

of a less depth than the recess 5, as shown in Fig. 2 and is providedwith a concentric opening 7 to receive the shank 3 of the screw, saidopening having the outer end thereof enlarged to provide a seat 8 forthe head 4: of the screw. The washer 6 has diametrically opposeddiverging openings 9 and the outer side of a washer has diametricallyopposed alining grooves 10 establishing communication between the seat 8and the openings 9.

After the head t of the screw has been seated in the washer 6, amalleable staple 11, preferably made of wire is driven into the openings9 whereby the staple will engage in the slot of the screw head at andhave the ends of said staple clenched or bent between the inner face ofthe washer and the bottom of the recess 5, as shown in Fig. 2. With theends of the staple clenched, the staple cannot become accidentallydisplaced and with the staple engaging in the slotted head a of thescrew, said screw cannot rotate.

In Fig. 4, the openings 9 of the washer are in parallelism, while inFig. 6 the washer is rectangular or provided with flat faces 18. Thisform of washer can be mounted in a rectangular recess and the fiat facesprevent the washer from rotating.

What I claim is In a screw locking device, the combination with a pieceof material having a socket formed therein, and a screw mounted in saidpiece of material, of a washer mounted in said socket and of less depththan said socket, said washer having a seat formed therein to receivethe slotted head of said screw, said washer having diametrically opposedopenings formed therein, and 'a malleable staple extending through theopenings of said washer and engaging in the slotted head of said screwwith the ends of said staple clenched against the inner face of saidwasher.

In testimony whereof I aflix my signature in the presence of twowitnesses.

JOHN THOMAS.

\Vitnesses:

MAX H. SRoLovITz, KATHERINE ERRETT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, 1). C.

